text: Phosphate processing operations that use flotation as the principal mechanism to concentrate the phosphate-bearing minerals usually discard particles smaller than 20 μm in diameter. This is because the fine particles have had poor flotation performance and because their presence decreases the flotation performance of the coarse particles.
  Legend International Holdings Incorporated ("Legend") owns major phosphate deposits that average 20–60% particles less than 20 μm that contain up to 50% of the phosphate. This makes the traditional phosphate concentration practice uneconomic for these deposits. In response, Legend developed a process based on using the Jameson Cell in a rougher-scavenger-cleaner configuration to recover at least 80% of the phosphate at a grade of at least 32% PO from a feed with a particle size distribution of up to 80% less than 20 μm.